I want to launch a web application, and I have a question: how do I know if it can handle the influx of users? I don't want it to crash on the first day. I think I need some performance testing services, but I don't know where to start.
If the project is serious and aimed at a large number of users, you can't go anywhere without normal testing. Performance testing services help to identify bottlenecks in advance, so that you don't catch bugs later on. All information on the topic is available here - you can see how they work and what they offer: https://pharosproduction.com/performance-testing-services